Josh Altman, Josh Flagg, David Parnes, and James Harris are the real-estate agents who star on Bravo's "Million Dollar Listing: Los Angeles," which airs Wednesdays at 9 p.m.

On every episode, these men wheel and deal over the most expensive property in the city with the richest people in the world. Los Angeles has always attracted people from all corners of the world to its year-round good weather and accessibility to all kinds of terrain, from beaches to mountains and desert. And all that doesn't come cheap.

So, who are these guys and what places them among the best in Los Angeles?

1/

Josh Altman

Josh Altman joined the series in its fourth season in 2011.
Tommy Garcia/Bravo

Altman cofounded the real-estate company The Altman Brothers.Altman created the company with his brother, Matt Altman. They're known for record-breaking sales, including the most expensive one-bedroom sold in LA's history for $21.5 million, the most expensive condo sale in Santa Monica history for $10.5 million, and the highest price-per-square-foot home ever sold in the Hollywood Hills.

He isn't an LA native. Altman was actually born in Newton, Massachusetts. He went on to major in speech communication and play football at Syracuse University in New York. After moving to LA after college, Altman began his real-estate career by flipping houses. He then created his own finance company.

Altman shared his secrets to selling in a newly published book.He wrote a bestselling book titled "It's Your Move." In it, he shares his take on negotiating, leadership, and how to outsmart the competition.

He's engaged — again! After one failed attempt at a wedding, Josh is trying it again with the same girl, Altman and Heather Bilyeu told Us Weekly in September. Their nuptials will go down in April 2016.

2/

Josh Flagg

Josh Flagg has been with the show since its pilot.
Tommy Garcia/Bravo

Josh Flagg has been on the show the longest. Although he's the show's youngest cast member at 30, Flagg has been on the series the longest. He started on "Million Dollar Listing" circa 2005 with the show's pilot. Since then, the two other original cast members, Chad Rogers and Madison Hildebrand, left. Josh Altman, James Harris, and David Parnes have since joined the show.

He is one of the top agents in LA. Flagg, who started his real-estate career at 18, has amassed more than a million dollars in real-estate sales in the last year. According to his website, he's No. 1 in LA for volume and No. 2 for sales. He once held the listing for the most expensive home in the US, which was priced at $150 million. He made Forbes' 30 Under 30 list for real estate at 26.

James Harris and David Parnes

James Harris and David Parnes joined "Million Dollar Listing: Los Angeles" in Season 7.
Tommy Garcia/Bravo

Yes, they're a package deal. Harris and Parnes have been best friends since childhood. Now as partners, they have sold over $165 million of real estate in 2014, and they are on target to sell over $200 million for 2015.

They've made names for themselves in LA quickly. Harris moved to LA from London around 2004. Parnes followed suit five years later. Between them, they've been named on the The Hollywood Reporter's list of "Hollywood's Top 25 Real Estate Agents" twice.

Both are proud to lead sober lives. The two have talked on the show about their partying days and how they went overboard. Parnes is about seven years sober now, while Harris has eight years under his belt.

They're off the market.Harris is happily married to his wife, Valeria. They have two daughters, Sofia and Chloe. And Parnes got engaged to girlfriend Adrian Abnosi in September. They have five dogs, which they treat like children.